Yes exactly the problem - the gate starts from a wrong position- but docks correct. and when undocking it moves back to wrong position again. Then your push start, moves about 10 meters back, and suddenly Gate jump to normal position again.
In an airport from Vidan Design EKBI - have SODE from beginning, I deleted them and inserted GSX jetways, ALL gates have the problem...
Looking forward to the problem fix, and glad you also can find the issue now.
And dont think its the jetway model. think its something in these specific airports- and until know I have seen the problems with airports already have SODE - like etc. KJFK. and EKBI